Graf 320001 Instrucciones Para La Instalacion Y Mantenimiento página 15

6.
6.2.8 Routing the connections
All supply and overflow lines have to be routed with an incline of at least 1%. The lines are connected to
pre-drilled recesses on the tank or to mould ports to be opened. If the tank overflow is connected to the
public duct system, it has to be protected against backwater according to DIN 1986 for mixed ducts via a
lifting system or when it is connected to a pure rain water duct via a backwater gate.
If the tanks are installed in a module system of more than2 tanks, the supply line has to be installed on
the first and last tank. In this case the withdrawal is implemented in the middle tank. The fist and the last
tank have to be equipped with an overflow as well.
All suction respectively pressure and control lines have to be routed through an empty conduit that has to
be routed as straight as possible and with an incline, but without bending. Required bends have to be
implemented with 30° moulded parts. The empty conduit has to be as short as possible.
Important: The empty conduit has to be connected to a recess above the max water level.
In order to create ventilation for the tank, a DN 100 plastic tube for underground installation has to be
connected to the free recess and routed in an ascending manner (discharge end point
Order No. 369017). Connection to ventilation systems of other buildings is inadmissible.
The tank head has to be put on one of the moulded and opened ports DN 200 with sleeve. It
can be shortened from above, but must not be extended in any case. The telescope 200 with
removable cover forms the end with the surface (accessories, item number 322026).
Concrete shafts or similar must not be used by any means, but only the GRAF tank head DN
200.
The system as a whole has to be checked for leaks, cleanliness, and stability at least every three months.
The system as a whole should be maintained every 5 years. In doing so, all system components have to
be cleaned and checked for functionality. Maintenance works should be conducted as follows:
Empty tank completely
•
Remove immovable residua using a pressure washer through the tank head
•
Remove all contaminations from the tank
•
Check all installation parts for proper seat
•
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Overground and underground installation
7. Installation tank head DN 200
8. Service and maintenance
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2019-03